US Bridges

HWY River ST over Water Mystic River

Fair

Middlesex County, Massachusetts · Town Line Med Arl · Structure no. A100084D3DOTNBI

Built
1938
87 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete
Length
60 ft
1 main span
Daily traffic
5,302
2019 count
Owner
State
State Highway Agency

About this bridge

HWY River ST over Water Mystic River is a concrete arch - deck carrying HWY River ST over Water Mystic River in Middlesex County, Massachusetts. It was built in 1938, so it is 87 years old, older than the Massachusetts average of 63.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,302 vehicles a day, roughly 5% of them trucks, projected to reach 4,738 by 2032. The structure is 60 ft (18.3 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY River ST
CrossesWater Mystic River
LocationTown Line Med Arl
RouteCity Street 0
CountyMiddlesex County
StateMassachusetts
Coordinates42.41554, -71.13839
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span60 ft (18.3 m)
Deck width60 ft (18.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,302 (2019)
Projected traffic4,738 by 2032
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$535,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY River ST over Water Mystic River built?

It was built in 1938, making it 87 years old in 2025.

What condition is HWY River ST over Water Mystic River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does HWY River ST over Water Mystic River carry?

About 5,302 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is HWY River ST over Water Mystic River?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.3 m) and a deck 60 ft wide.

Who owns HWY River ST over Water Mystic River?

It is owned by the State Highway Agency.